CODEWITHSUNDEEP
c#classextension-methods
Xander Luciano
Xander Luciano

Reputation: 3893

Using an extension method without calling class name

I'm trying to create a static(global) function that I can call from within any script in my project using an extension method, but I don't think I am implementing it properly.

file:extensions.cs

namespace CustomExtensions
{
  public static class MathExt
  {
    public static float Remap (float value, float from1, float to1, float from2, float to2)
    {
      return (((value - from1) * (to2 - from2) / (to1 - from1)) + from2);
    }
  }
}

Now from within another file I am want to be able to use this syntax:

using CustomExtensions;

public class MySound
{
  public void SetPitch(float rpm)
  {
    pitch = Remap(rpm, minRPM, maxRPM, 0.5f, 1.5f);
  }
}

However I get an error unless I do MathExt.Remap(rpm, 720, maxRPM, .75f, 1.75f);

I also tried using CustomExtensions.MathExt; but it still threw an error out.

I would like to call this function without having to declare MathExt before it. I realize that it's simple enough to just add the classname, but I want to understand what I am doing incorrectly.

Upvotes: 3

Views: 1069

Answers (2)

David Pilkington
David Pilkington

Reputation: 13626

if you are using C#6 you can try and use 

using static CustomExtensions.MathExt;

Link

Upvotes: 4

Patrick Hofman
Patrick Hofman

Reputation: 157098

That is not an extension method. You didn't define the object that is the base for the extension method (you do that using this):

public static float Remap (this float value, float from1, float to1, float from2, float to2)
{ }

Then you call it:

pitch = rpm.Remap(minRPM, maxRPM, 0.5f, 1.5f);

Upvotes: 3

Related Questions